Process for capturing CO2 from a CO2-containing gas stream using a thermoresponsive copolymer

A method for capturing CO2 from a CO2-containing gas stream, comprising:

• (a) contacting a CO2-containing gas stream with a CO2-absorbing agent in an absorption step in a vessel with a maximum temperature T1, resulting in absorption of CO2, wherein the CO2-absorbing agent comprises a polymer and an amine component dissolved in an aqueous medium, wherein the polymer is a thermoresponsive copolymer comprising an amine monomer distributed through the copolymer based on one of the following monomer combinations:
• the combination of dimethylamino propyl acryl amide and n-isopropyl methacryl amide, the combination of n-isopropyl methacryl amide and dimethylamino ethyl acrylamide, the combination of dimethylaminoethyl acrylate and diethyleneglycolmethacrylate, or the combination of n-penta-methyleneacrylamide and dimethylamino propyl methacrylate, and wherein the amine component is present in an amount of up to 20 wt.%, and
• (b) subjecting the CO2-containing absorbing agent to a desorption step in a vessel with a maximum temperature T2, resulting in the release of CO2, wherein T1 is below the LCST of the thermoresponsive polymer at maximum CO2 loading, and T2 is above the LCST of the thermoresponsive polymer at minimum CO2 loading.